As a developer, I absolutely love days like today. If the high-level "improves performance and stability and fixes bugs" changelog of Android 4.1.2 isn’t good enough for you, how about we dive into the actual low-level source code commit.

ERROR: JDWP Unable to get JNI 1.2 environment, jvm->GetEnv() return. This seems to be an old error in Eclipse, it's a known bug from a few.